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fchamp(2) Scilab Function fchamp(2)
NAME
fchamp - draw a 2d vector field
CALLING SEQUENCE
fchamp(f,t,xr,yr,[arfact,brect,strf])
PARAMETERS
f : a function which describes the vector field.
- It can be a function name f, where f is supposed to be a func-
tion of type [y]=f(t,x,[u]) ( f returns a column vector of
dimension 2, y, which gives the value of the vector field f at
point x and time t.
- It can also be an object of type list, list(f1,u1) where f1 is
a function (f [y]=f1(t,x,u) ) and u1 gives the value of the
parameter u.
t : The selected time.
xr,yr : two vectors of size (1,n1) (1,n2) which specifies the grid on
which the vector field is to be computed.
arfact,brect,strf
: optional arguments, see champ.
DESCRIPTION
the fchamp is used to draw a two dimensional vector field described by a a
Scilab external.
Enter the command champ() to see a demo.
EXAMPLE
deff('[xdot] = derpol(t,x)',['xd1 = x(2)';
"xd2 = -x(1) + (1 - x(1)**2)*x(2)";
"xdot = [ xd1 ; xd2 ]"]);
xf= -1:0.1:1;
yf= -1:0.1:1;
fchamp(derpol,0,xf,yf);
xbasc();
fchamp(derpol,0,xf,yf,1,[-2,-2,2,2],"011");
AUTHOR
J.Ph.C.
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